989
FNCA52 TJSJ 110930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
530 AM AST MON AUG 11 2025
DISCUSSION
AFTERNOON SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED OVER
WEST CENTRAL AND WESTERN PUERTO RICO, LOWER RAIN CHANCES ELSEWHERE.
KBDI VALUES REMAIN ABOVE FIRE DANGER THRESHOLDS ACROSS GUANICA
(608) AND LOWER IN CABO ROJO (535). MINIMUM RELATIVE HUMIDITY
VALUES MAY DROP INTO THE MID 50S TODAY, PARTICULARLY ACROSS
SOUTHERN PR, WHILE WINDS SHOULD BE AROUND 16 MPH OR LESS ACROSS
COASTAL AREAS. WE WILL CONTINUE TO MONITOR THE CONDITIONS CLOSELY
FOR ANY UPDATE.
PRZ014-120930-
SOUTHEAST COASTAL PLAINS-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 40
TEMP (24H TREND) 92 (+2) 75 (-1) 93
RH % (24H TREND) 55 (-1) 94 (+5) 59
WIND 20FT/EARLY(MPH) E 16 G21 E 13 G17 E 16 G21
WIND 20FT/LATE(MPH) E 16 G21 E 13 G17 E 16 G21
MIXING HGT(FT-AGL/MSL)5220 4790
TRANSPORT WND (MPH) E 14 E 14
VENT RATE (KT-FT) 62640 57480
DISPERSION 5 5
DSI 5 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-120930-
SOUTHERN HILLS-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 30
TEMP (24H TREND) 89 (+4) 71 (-2) 89
RH % (24H TREND) 58 (-10) 99 (+7) 62
WIND 20FT/EARLY(MPH) E 12 E 11 E 11
WIND 20FT/LATE(MPH) E 12 E 11 E 11
MIXING HGT(FT-AGL/MSL)5660 5240
TRANSPORT WND (MPH) E 13 E 13
VENT RATE (KT-FT) 62260 57640
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-120930-
NORTH COASTAL PLAINS-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 20 40
TEMP (24H TREND) 91 (+2) 74 (-1) 90
RH % (24H TREND) 62 (-6) 99 (+5) 67
WIND 20FT/EARLY(MPH) E 16 G19 E 14 E 16 G18
WIND 20FT/LATE(MPH) E 16 G19 E 14 E 16 G18
MIXING HGT(FT-AGL/MSL)4720 4530
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 61360 54360
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-120930-
NORTHERN HILLS-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 20 70
TEMP (24H TREND) 88 (+1) 71 (-1) 89
RH % (24H TREND) 65 (-3) 100 (+3) 68
WIND 20FT/EARLY(MPH) NE 13 E 13 NE 13
WIND 20FT/LATE(MPH) NE 13 E 13 NE 13
MIXING HGT(FT-AGL/MSL)5270 4980
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 52700 49800
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-120930-
WEST COAST-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 30 40
TEMP (24H TREND) 91 (+1) 72 (-1) 93
RH % (24H TREND) 59 (-6) 99 (+5) 61
WIND 20FT/EARLY(MPH) SE 11 E 12 E 11
WIND 20FT/LATE(MPH) SE 11 E 12 E 11
MIXING HGT(FT-AGL/MSL)4780 4490
TRANSPORT WND (MPH) E 8 E 9
VENT RATE (KT-FT) 33460 35920
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-120930-
EASTERN INTERIOR-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 30 60
TEMP (24H TREND) 90 (+3) 72 (-2) 89
RH % (24H TREND) 60 (-7) 100 (+5) 66
WIND 20FT/EARLY(MPH) E 12 E 11 E 11
WIND 20FT/LATE(MPH) E 12 E 11 E 11
MIXING HGT(FT-AGL/MSL)5680 5560
TRANSPORT WND (MPH) E 14 E 12
VENT RATE (KT-FT) 68160 55600
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-120930-
LUQUILLO MOUNTAIN RANGE-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 50 60
TEMP (24H TREND) 85 (+4) 70 (-2) 85
RH % (24H TREND) 68 (-8) 100 (+2) 71
WIND 20FT/EARLY(MPH) E 11 E 10 E 9
WIND 20FT/LATE(MPH) E 11 E 10 E 9
MIXING HGT(FT-AGL/MSL)4230 4090
TRANSPORT WND (MPH) E 14 E 13
VENT RATE (KT-FT) 50760 44990
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-120930-
CENTRAL MOUNTAIN RANGE-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 30 60
TEMP (24H TREND) 87 (+5) 68 (-2) 87
RH % (24H TREND) 65 (-8) 99 (+3) 69
WIND 20FT/EARLY(MPH) E 9 E 10 E 8
WIND 20FT/LATE(MPH) E 9 E 10 E 8
MIXING HGT(FT-AGL/MSL)5820 5570
TRANSPORT WND (MPH) E 10 E 10
VENT RATE (KT-FT) 52380 50130
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-120930-
CAYEY MOUNTAIN RANGE-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 30 60
TEMP (24H TREND) 85 (+3) 70 (-2) 86
RH % (24H TREND) 63 (-8) 100 (+1) 69
WIND 20FT/EARLY(MPH) E 10 E 9 E 10
WIND 20FT/LATE(MPH) E 10 E 9 E 10
MIXING HGT(FT-AGL/MSL)4740 4950
TRANSPORT WND (MPH) E 15 E 13
VENT RATE (KT-FT) 61620 54450
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-120930-
VIEQUES-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 50 60
TEMP (24H TREND) 90 (+1) 77 (-1) 91
RH % (24H TREND) 56 (-6) 95 (+8) 58
WIND 20FT/EARLY(MPH) E 14 G18 E 16 G19 E 12
WIND 20FT/LATE(MPH) E 14 G18 E 16 G19 E 12
MIXING HGT(FT-AGL/MSL)3460 2940
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 48440 35280
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-120930-
CULEBRA-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 40 60
TEMP (24H TREND) 92 (+3) 77 (-2) 92
RH % (24H TREND) 57 (-8) 96 (+9) 60
WIND 20FT/EARLY(MPH) E 14 G18 E 14 G19 E 11
WIND 20FT/LATE(MPH) E 14 G18 E 14 G19 E 11
MIXING HGT(FT-AGL/MSL)3330 3110
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 46620 37320
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-120930-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 20
TEMP (24H TREND) 92 (+2) 75 (-1) 93
RH % (24H TREND) 55 (-1) 89 (+5) 56
WIND 20FT/EARLY(MPH) SE 17 G22 E 13 SE 16 G21
WIND 20FT/LATE(MPH) SE 17 G22 E 13 SE 16 G21
MIXING HGT(FT-AGL/MSL)5150 4700
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 56650 56400
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-120930-
SAINT THOMAS AND SAINT JOHN-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 20 60
TEMP (24H TREND) 88 (+2) 76 (-3) 88
RH % (24H TREND) 62 (-7) 98 (+11) 67
WIND 20FT/EARLY(MPH) E 16 G19 E 16 G20 E 12
WIND 20FT/LATE(MPH) E 16 G19 E 16 G20 E 12
MIXING HGT(FT-AGL/MSL)3370 2830
TRANSPORT WND (MPH) E 17 E 15
VENT RATE (KT-FT) 50550 36790
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-120930-
ST CROIX-
530 AM AST MON AUG 11 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 40
TEMP (24H TREND) 90 (+2) 77 (-2) 92
RH % (24H TREND) 59 (-8) 97 (+10) 61
WIND 20FT/EARLY(MPH) E 16 G19 E 16 G19 E 12
WIND 20FT/LATE(MPH) E 16 G19 E 16 G19 E 12
MIXING HGT(FT-AGL/MSL)4290 4160
TRANSPORT WND (MPH) E 18 E 16
VENT RATE (KT-FT) 68640 58240
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page